refactor: Removed unused import

[fg-mindee]

This PR simply removes an unused import from the recognition post processing

[codecov]

Codecov Report

Merging #78 (0f88899) into main (14279aa) will increase coverage by 0.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   93.90%   94.40%   +0.50%     
==========================================
  Files          24       24              
  Lines         787      786       -1     
==========================================
+ Hits          739      742       +3     
+ Misses         48       44       -4     

Flag	Coverage Δ
unittests	94.40% <ø> (+0.50%)	⬆️

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Impacted Files	Coverage Δ
doctr/models/recognition/postprocessor.py	90.00% <ø> (-0.48%)	⬇️
doctr/models/core.py	85.71% <0.00%> (+8.16%)	⬆️

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